Submersible Filter Pump With UV Light Submersible UV sterilizer allows simple and effective filtration, it controls harmful microorganisms and free-floating algae. Compact and versatile units are ready to install no additional tubing or circulation pump required. Built-in pump directs water borne organisms past the UVC lamp for clean, clear aquarium water. Install in vertical or horizontal position right in your aquarium or sump. For fresh, saltwater aquariums or garden ponds includes UV unit with built-in pump and UV ballast, UVC lamp and suction cup mounting brackets.